Industrial production method for preparing nanometer lithium iron phosphate by adopting solvent thermal method

Abstract

The invention discloses an industrial production method for preparing nanometer lithium iron phosphate by adopting a solvent thermal method. The industrial production method comprises the following steps that phosphorus source compounds, iron source compounds, lithium source compounds, carbon sources and solvents are proportionally and sequentially added into a sealed reaction kettle and are uniformly mixed and stirred, the stirring temperature rising reaction is carried out in inert atmosphere, primary products of the lithium iron phosphate are obtained, solid and liquid separation is carried out, washing and drying are carried out, the roasting is carried out in the inert atmosphere, and the lithium iron phosphate products are obtained. Waste water and waste organic solvents generated in the production process are recovered and reutilized through reduced pressure distillation. The obtained product of the lithium iron phosphate materials has fine primary particle size and narrow particle size distribution, in addition, the distribution is uniform, the conductivity is good, the electrochemical performance of products is good, the product batch consistency is good, the operation of a recovery method is simple, the control is easy, the energy consumption is low, and the method is suitable for industrial production and application.

Description

technical field [0001] The invention relates to a production method of lithium ferrous phosphate material for lithium ion power batteries, in particular to an industrial production method of nanoscale lithium iron phosphate for lithium ion power batteries prepared by a solvothermal method. Background technique [0002] As an emerging power source, lithium-ion batteries have many advantages such as high voltage, high capacity, light weight, small size, safety and environmental protection, and are widely used in mobile phones, notebook computers, digital products and other fields. With the increasing energy crisis, The application of lithium-ion batteries in new energy vehicles has gradually become a hot research field. At present, most commercial batteries use lithium cobaltate as the cathode material. However, due to the lack of cobalt resources, lithium cobaltate has problems such as high material price and safety. Therefore, people have been developing other lithium-ion ba...

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Problems solved by technology

[0003] At present, the mainstream lithium iron phosphate production method is the high-temperature solid-phase method. Although this method is simple to operate and easy to produce, the sintered product has large primary particles, serious agglomeration, and uneven and wide particle size distribution, which leads to the diffusion of lithium ions. The channel is too long, the electrochemical performance of the product is poor, and the product batch consistency is poor, etc.

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